Stand by for a day of drama at Old Trafford – and one which could spell the beginning of the end for Jose Mourinho's time at Manchester United.

For if Mourinho doesn't get at least one of the five names he gave to negotiator Ed Woodward at the start of the summer expect major fireworks.

Relations between Mourinho and Woodward are at a low ebb.

An awkward public meeting on tour in America and radio silence on new arrivals after the early signings of Brazilian midfielder Fred and young Porto full back Diogo Dalot have left United looking at a frantic final day scramble before the transfer window slams shut at 5pm.

And if one the manager's original centre-half targets - Harry Maguire, Jerome Boateng or Toby Alderweireld - don't arrive in Manchester before the close of play it's sure to trigger a Mourinho meltdown.

Mourinho has done a lot of complaining over the summer (Image: REUTERS)

The Portuguese has spoken out over United's dealings in the transfer market (Image: REX/Shutterstock)

But at least on Deadline Day United's Portuguese coach and Woodward are on the same page on one important issue – the future of Paul Pogba.

They might disagree on plenty but they won't be letting French World Cup winning star Pogba leave – for Barcelona or anywhere.

Super-agent Mino Raiola is agitating to get the powerful Frenchman a move only two seasons after his world record £89million move from Juventus.

Barcelona are reported to have made one player plus cash bid already but United weren't interested in acquiring defender Yerri Mina and talented midfielder Andre Gomes as well as £45 million in return for Pogba.

They believe Pogba is still central to their plans of closing the gap on Manchester City – especially after his spectacular double to shoot down Pep Guardiola's stars at The Etihad Stadium in April.

Mourinho and Woodward are at loggerheads (Image: John Peters/Man Utd via Getty Images)

And selling him, even to Spain, makes no sense when it would leave them no time to buy a replacement of the same stature – if one were available.

Mourinho wanted Inter Milan winger and World Cup Finalist Ivan Perisic a year ago and has privately complained on more than one occasion it was a big miss.

He couldn't get Willian out of Chelsea this summer and he's had no luck so far with a centre-back.

So stand-by for new levels of Mourinho moaning if he doesn't land someone – anyone – before 5pm today.

And maybe even Jose's own future will be on the agenda if it all goes pear-shaped.